package com.heima.kafkas.sample;

import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;


import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * 消费者
 */
@Slf4j
public class ConsumerQuickStart {

    public static void main(String[] args) {
        try {
            //1.添加kafka的配置信息
            Properties properties = new Properties();
            //kafka的连接地址
            properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.78.128:9092");
            //消费者组
            properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
            //消息的反序列化器
            properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
            properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

            //2.消费者对象
            KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

            //3.订阅主题
            consumer.subscribe(Collections.singletonList("yyf-topic"));

            System.out.println("开始监听kafka消息");
            //当前线程一直处于监听状态
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                if (!consumerRecords.isEmpty()) {
                    for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                        System.out.println("收到消息 - key: " + consumerRecord.key() + ", value: " + consumerRecord.value());
                        log.info("收到消息 - key: " + consumerRecord.key() + ", value: " + consumerRecord.value());
                    }
                }
            }
        } catch (Exception e) {
            System.out.println("异常信息");
            throw new RuntimeException(e);
        }

    }

}
